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The term poka-yoke was applied by Shigeo Shingo in the 1960s to industrial processes designed to prevent human errors. [1] Shingo redesigned a process in which factory workers, while assembling a small switch, would often forget to insert the required spring under one of the switch buttons.
A yoke, alternatively known as a control wheel or a control column, is a device used for piloting some fixed-wing aircraft. [1] The pilot uses the yoke to control the attitude of the plane, usually in both pitch and roll. Rotating the control wheel controls the ailerons and the roll axis.
An aircraft moves at any given moment in one or more of three axes: roll (the axis that runs the length of the fuselage), pitch (the axis running laterally through the wings), and yaw (the vertical axis around which the front of the aircraft turns to the left or right whilst its rear turns toward the opposite direction).
Ailerons are mounted on the trailing edge of each wing near the wingtips and move in opposite directions. When the pilot moves the aileron control to the left, or turns the wheel counter-clockwise, the left aileron goes up and the right aileron goes down. A raised aileron reduces lift on that wing and a lowered one increases lift, so moving the ...
Yoke may also refer to: Yoke (aeronautics), the "wheel" that controls the ailerons and elevator on aircraft; Yoke (unit of measurement) used in the time of the Domesday Book for tax purposes in Kent; Yoke (clothing), part of the construction of a garment; Yoke (Lake District), a high point in Cumbria, England; Yoke Island, Palmer Archipelago ...
Also, because the rotors must rotate in opposite directions, the mast is more complex, and control linkages for pitch changes to the upper rotor system must pass through the lower rotor system. An example of coaxial design in a compound helicopter was the Sikorsky Skyraider X, which also had pusher prop at the rear. [31]
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The word "yoke" is believed to derive from Proto-Indo-European *yugóm (yoke), from root *yewg- (join, unite), and is thus cognate with yoga. [1] [2] This root has descendants in almost all known Indo-European languages including German Joch, Latin iugum, Ancient Greek ζυγόν (zygon), Persian یوغ (yuğ), Sanskrit युग (yugá), Hittite 𒄿𒌑𒃷 (iúkan), Old Church Slavonic ...